I think the following in this aricle is very mis-leading.....
The owner of a lodge on the road where the Kims' car was stuck had told authorities three days before Kati Kim and her daughters were found that he had seen tire tracks in the snow, but he hadn't been able to follow them in his snowmobile once he hit bare ground. No one followed up.
"Three days before".....was Wednesday, IIRC, Wednesday was the first day this family was reported missing.
They were found on Monday. He made that report on Friday...three days before they were found. If his information were followed they may have all been found on Saturday.